[Bug] MetadataAccount invalid parsing

[timaiv]

Describe the bug
{"Specified argument was out of the range of valid values. (Parameter 'offset')"} exception in ParseData.

Reproduce
Create nft without creators but with primarySaleHappened.

Why
(binData.GetU16(MetadataAccountLayout.creatorsOffset) gives 256

1. MetadataAccountLayout creatorsOffset must be 321, not 322
2. creators is optional field.

Also, next fields missing

• primarySaleHappened (not set)
• isMutable (not set)
• editionNonce (not set)
• tokenStandard
• collection
• uses

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P.S.
Current used manual deserializing is so bad, better use schema (like here), possible also code generator.